Allows you to use EL84s in place of 6L6GC, 5881, EL34, and 6V6GT power tubes in real Class A operation. Supply voltage is auto adjusted by the Tone Bone so that no rebiasing is needed. Overall power output is reduced so that saturation of the output stage occurs much earlier. Its saturation distortion has great sustain, fat tone, and optimized dynamic response. Comes complete with a pair of selected Tesla EL84 triode tubes and 2 Play Tube adapters.

Outstanding product for the money. Hassle free and easily reversible "amp customising" for the masses.These little beauties seem to be a pro musicians secret studio weapon - great for playing at home too.Does the same thing as the THD product, with more saturated tone for far less cash.

Replaced the 6L6's in my Mesa Boogie 50 Caliber with a set of the triods and it puts out a butt kicking 12 watts. I recommend the pentode version for the larger halls, however, as the triods will lose ground against larger amps unless your amp is miked.